Herbivory

Gorillas eat fruit, but the fruit trees are being cut down. This means that there is less fruit for the gorillas to eat.

Predation

Leopards are very opportunistic hunters, sometimes they will even attack a gorilla if they have the chance. However, as fruit trees and the animals that eat them decline in number, the leopard will have less prey.

Parasitism

Fleas often find a home in the fur of Mountain Gorillas. As the gorillas decline in number, so will the fleas.

Mutualism

Bacteria live in the gorilla's digestive system and help the gorillas to process plant material. When the gorillas die off, the bacteria will lose food and a home.

Commenalism

Trees are unaffected by the gorillas who live in the forests. However, as the trees are cut down, the gorillas lose their habitat and also die off.